How Birds Got (And Kept) Their Beaks

Birds are known for having beaks, however at what point between being a humongous therapod and tiny sparrow did they get them, and why?

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Sources:

https://www.nature.com/articles/s4158...
https://www.ncbi.nlm.nih.gov/pubmed/2...
https://www.ncbi.nlm.nih.gov/pubmed/2...
https://www.pnas.org/content/114/41/1...

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